Study of..... chemical reactions 2 🎷

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*།།◆️______◆️།།*

👉 माहिती विज्ञानाची 🎷

What is a chemical reaction?

 A reaction in which a change in reactant or reactants produces a substance with new properties or substances.

In other words a process in which reactants undergo a change in their chemical properties, resulting in the formation of new substances.

In chemical reactions chemical properties change.

 Chemical changes are irreversible.

*།།◆️______◆️།།*

 Today we are looking at the types of chemical reactions.

1. Combination Reaction: When two or more reactants combine to form only one product then it is called a combination reaction.

   Ex. Hydrogen reacts with oxygen in the air to form water.

     

2H2 + O2 = 2H2O

 Iron reacts with sulfur to form iron sulphide.

  

 Fe + S = FeS

   

Many of us are familiar with the example of two reactants but many students don't know about 3 reactants.

  

Ex. Carbon dioxide gas is passed through freshly prepared quicklime for long duration then we get calcium bicarbonate a single product.

    

 CaCO3 + H2O + CO2 = Ca(HCO3)2

𝄅𝄄*~> ~*✿⃝𝆭⧗⃪ ꯭𝄈𝄅𝄄𝄅🪈꯭

2. Decomposition Reaction: A reaction in which from only one reactone two or more products form is called a decomposition reaction.

   Ex. Calcium carbonate 

when heated up to 1000* celsius temperature it decomposes into calcium oxide and carbon dioxide. 

    

 CaCO3 = CaO + CO2

 *~-°__. . O. . ..___°-~*

3. Displacement Reaction:

When a highly reactive element displaces a less reactive element to form a new product it is called a displacement reaction.

   Ex. Zinc displaces copper from copper sulfate solution.

     

Zn + CuSO4 = ZnSO4 + Cu

 *~-°__. . O. . ..___°-~*

4. Double Displacement Reaction: when there is an exchange of ions that take place in between two reactants to form two new products and one of them is precipitated then it is called a double displacement reaction.

In a double displacement reaction two reactants are two metal salts.

   Ex. Barium chloride reacts with sodium sulfate to produce barium sulfate and sodium chloride.

     

BaCl2 + Na2SO4 = BaSO4 + 2NaCl

𝄄*~> ~*✿⃝𝆭⧗⃪ ꯭𝄈𝄅𝄄𝄅🪈꯭

5. Neutralization Reaction: when acid reacts with base to form salt and water it's called neutralization reaction.

   Ex. Hydrochloric acid reacts with sodium hydroxide to form sodium chloride and water.

    

HCl + NaOH = NaCl + H2O

 *~-°__. . O. . ..___°-~*

6. Exothermic Reaction: At the time of chemical reaction when heat is liberated then it is called as exothermic reaction.

   Ex. Sodium reacts with water to produce sodium hydroxide and hydrogen gas.

     

2Na + 2H2O = 2NaOH + H2

In this process too much heat is liberated.

*✦-------✦*

7. Endothermic Reaction: The reaction in which heat is absorbed then it is called an endothermic reaction.

   Ex. Sugar when added in water it absorbs heat.

     

C12H22O11 (s) + H2O (l) = C12H22O11 (aq)

*✦-------✦*

8. Redox Reaction: A reaction in which oxidation and reduction takes place simultaneously then it is called a redox reaction.

   Ex. 

*✦-------✦*

   

 9.  Fast Reaction: The reaction which takes a shorter time to complete is called a fast reaction.

Ex.Sodium reacting with water.

  10 .Slow Reaction: The reaction which takes more time for completion is called a slow reaction.

The reactions between covalent compounds are slow.

 Ex. A) Rusting of iron B) Fermentation process 

        Fe2O3.nH2O

*✦-------✦*

   11. Combustion Reaction: A reaction between fuel and oxygen is called a combustion reaction or burning.

In this reaction

 energy is released in the form of light and heat.

 Hydrogen and oxygen reacting to form water.

 2H2 + O2 = 2H2O

*།།◆️______◆️།།*

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        *आपला दिवस आनंदी जावो.*🎷

𝄄*~> ~*✿⃝𝆭⧗⃪ ꯭𝄈𝄅𝄄𝄅🪈꯭